Percentage Calculator: All Formulas with Step-by-Step Examples

Published: 2026-05-11 · 5 min read

Percentages are used everywhere — from shopping discounts to tax calculations. Master all percentage formulas with clear examples.

Essential Percentage Formulas Percentages are one of the most practical math concepts in daily life. Whether you're calculating a tip, figuring out a discount, or analyzing data, these formulas will help. 1. What is X% of Y? Formula: X ÷ 100 × Y Examples: - 15% of 200 = 15 ÷ 100 × 200 = 30 - 8.5% of 1,000 = 8.5 ÷ 100 × 1,000 = 85 - 20% of 75 = 20 ÷ 100 × 75 = 15 2. X is what percent of Y? Formula: X ÷ Y × 100 Examples: - 25 is what % of 200? = 25 ÷ 200 × 100 = 12.5% - 45 is what % of 9...

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